Paper-pulp shredder.



G. C. HOWARD.

PAPER PULP SHREDDER APPLICATION FILED MAR. 31, 1915.

Patented Jan. 18, 1916.

IIVVENTOR Gay 6? Howard WITNESSES:

ATTORNEY Y citizen of the United States, residing at,

' saturated GUY G. HOWARD, OF EVERETT, WASHINGTON.

PAPER-PULP SHREDDER.

Lie-e503.

Specification of Letters Patent.

Patented Jan. 18, 1916.

Application filed March 31, 1915. Serial No. 18,252.

To all whom it may concern:

Be it known that I, GUY C. HOWARD, a

Everett, in the county of Snohomish and State of Washington, have invented certain new and useful Improvements in Paper- .lulp Shredders, of which the following is a specification. i

This invention relates to improvements in machinery of the tube-mill type for handling pulp and, more particularly, to improvements in apparatus forshredding or reducingto a fiuidic consistency stock that has already been pulped and stored in relatively dry condition or what is termed "laps."

The object of this invention is to provide a strong and comparatively simple machine into which stock that has been pulped and lapped may be introduced to be thoroughly and submitted to a mild abrasive ul' rubbing action to reduce itto a semiliquid consistency in preparation for further treatment. 7

The. invention consists in the novel construction. adaptation and combination of 'parts fully described in the following specification, illustrated in the accompanying drawings and finally set forth in the appended claims.

Referring to the drawings, Figure 1 is a view in longitudinal section of a pulp shredder embodyingmy invention and F ig. 2 is a view in cross section on broken line 2-2 of Fig. 1. i

In the handling of pulp material about a paper mill, it is frequently necessary for the purpose of storage or shipment that such n'iaterial. after it has been pulped, be permitted to dry in the form of sheets or bundles called a lap and then be againdisintegrated into pulp for further processof refinement or manufacture. It is also frequently desirable towork down waste paper into a condition for remaking it into paper or for making boxboard or. other similar products, and it is for this form of work that my shredder is especially designed. The purpose of this'shredder is not necessarily to effect a complete disintegration of the dried material into pulp, but simply to reduce it to a sufliciently liquid consistency to adapt it to be handled by apump to further processes.

My shredder effects a slow passage of material through the machine and affords suitable means and conditions for saturation and subsequent abrasive action. Subsequent description will show, the significance of the design inaccomplishing these two essentials in their logical order. Referring to the drawings throughout which like reference numerals indicate like parts, 1 is an in'clined cylindrical barrel of a tube mill that is provided at its discharge end with a perforated head 2, and termr mates in suitable axially disposed hollow trunnions 3 and 4 that are mounted for totationin bearings 5 and 6. i a

The trunnion 3 is of comparatively large diameter and serves as an inlet opening through which sheets orrol'ls of pulp material or' lap may be introduced while the trunnion-4 is of smaller diameter and communicates with a suitable discharge box 7 that is connected with a vertically-adjustable discharge pipe 8 that is adapted to be moved vertically within an outer pipe 9 by hand or any suitable means whereby the height of the'discharge overflow may be-regulated to regulate the height of the water level inside the drum. I

The mill 1 is provided at its discharge end with a head 10 upon which is a track or roller tread 11 that engages with a supporting roller 12 and is further provided with a circular gear rack 13 that is engaged by a driven pinion '14 by which the mill is rotated.

The screen 2 is spaced from the end plate 10 to form a chamber 15 and is provided with a plurality of perforations or slots 16 and with a plurality of peripheral notches 17 through which pulp may pass, the outer surface of such plate 2 having integrally formed water channels 18 that are connected 21 when the shell 1 is rotated.

The screen plate 20 is "provided with perfrozen material is being worked on.

forations or slots 23 through which pulp may pass to the chamber 21, the peripheral notches 17 of the header 2 permitting the discharge of such pulp into the chamber 15. Perforatedwater pipes 24 are provided within the chamber 21 and are connected with the water channels 18 in order that the pulp Within such chamber 21 may be sufficiently diluted to flow freely. V The shell 1 is braced by transverse tierods 25 that are disposed at spaced intervals and insure that the charge of material Within the mill will rotate, at least in part, with the mill instead of slipping on the surface and permitting the mill to rotate around it. Said rods also serve to engage the laps and assist in their disintegration,

The inlet end of the mill 1 is tapered, as shown, and Within such tapered portion are secured ribs or blades 26 helically disposed to have the effect of conveying forwardm'aterial introduced through the feed trunnion.

2. A water supply pipe 27 isdisposed to extend through the trunnion S and steam or hot water supply pipes 28 and 29 are provided at the supply and discharge ends, respectively, of'the machine for use'w ii en he header screen 2 is formed with radially directed ribs or blades 30 that divide the chamber 15 into segmental compartments, as illustrated by brokenlines in Fig. 2.

In the operation of my shredder, the material is fed through the-large trunnion 3. the drum 1 being kept full at all times and water as needed is furnished by the water supply pipe 27, such water serving to saturate the new material and then percolate downwardly into the lower portions of the drum 1. As the drum rotates the material becomes saturated and the fibe'rsseparate, the disintegration being effected by the abrasive action of the material on itself and on the inside of the shell due to the rotation of the drum and the. surging effect produced by the rrtation of the drum on its inclined axis. Material in contact with the screenplate 20 will continually pass through the perforatirns .23 into the chamber 21 and be discharged through the notches 11 into the chamber 15 and in a similar manner material in contact with 'the header-plate 2 will pass through the perforations 16 and thence be picked up by the inclined blades 30 and d scharged through the trunnion .4. The surging effect of the liquid charge due to the inclined axis of rotation of the drum 1 will tend to assist disintegration and will keep the screen-platesopen and free for the passage of pulp and a pumping effect due to the blades 30 onthe header-screen 2 and to the helically disposed blades 22 in the chamber 21 will produce a slight hydraulic head on the screen-plates which will assist the passage of pulp therethrough. The

fluid level within the drum 1 may be regulated by vertical adjustment of the discharge pipe 8 but such fluid level is usually maintained at practically the height shown by the line 31 and the drum is filled with fresh lap approximately to the line 32.

The design of this shredder really ellects three stages of dilution of the charge, viz.; the upper portion where the charge is merely wet, the semi-liquid lower portions within the drum below the line 31 and the disintegrated portion within the chambers 15 and 21. This arrangement conforms to the conditions required for the best efiiciency.

Obviously, changes in the design and arrangement :01? parts included, in my'beater may be resorted to without departing from the spirit of my invention or sacrificlng any of its advantages.

What I claim, is

1. A mill for reducing pulp, comprising a rotatable cylinder provided with axially disposed inlet and discharge openings, a header screen in the discharge end of said cylinder, and a concentrically disposed cylindrical screen'spaced within the walls of said cylinder to form an annular passage compartment for disintegrated pulp.

2. A mill for reducing pulp, comprising a rotatable-cylinder provided with axially disposed inlet and discharge openings, a header screen in the discharge end of said cylinder, and a concentrically disposed cylindrical screen spaced within the walls of said cylinder to form an annular passage compartment for disintegrated pulp, and a plurality of helically' arranged blades within said compartment.

3. A mill for reducing pulp, comprising an inclined rotatable cylinder provided with an inlet and a discharge opening. helical blades in said cylinder adjacent said inlet opening, a header screen in the discharge end of said cylinder, and a concentrically disposed cylindrical screen spaced within the walls of said cylinder to form a mumpartment f r disintegrated pulp.

4. A mill for reducing pulp, comprising an inclined rotatable cylinder provided with an inlet and a' discharge opening. helical blades in said cylinder adiacent said inlet opening. a header screen in the discharge end oi said cylinder. diametrically dispo ed tie-rods and a concentrieallv disposed erlindrical screen spaced within the walls of said cylinder to form a compartment for (listinte grated pulp.

5, A mill of the class described. comprising an inclined rotatable cylinder havin axially disposed inlet and dischargeopenings, helicallv disposed blades in said cylinder adjacent said inlet openings. a header screen spaced from thedischarge end' of said cylinder, a cylindrical screenspaced from the walls of said cylinder to forma compartment for finished material, and helically disposed blades between said cylindrical screen and the walls of said cylinder.

6. A mill of the class described, comprising an inclined rotatable cylinder havingaxially disposed inlet and discharge open-. ings, helically disposed blades in said cylinder adjacent said inlet openings, aheader: screen spaced from the discharge end of said a header screen spaced apart from, the dis chargeend of said cylinder-and provided with enlarged openings in-its periphery, a cylindrical screen disposed within said cylinder and spaced from the walls thereof to form a chamber for finished product. diametrically disposed tie-rods in said chamber" to agitate the charge of 1pulp, and helically disposed blades in the in inder.

8. A mill for reducing-paperpulp, comprising a drum mounted on an inclined axis vments.

10. A mill for reducing pulp, comprising an inclined rotatable cylinder provided with and provided with inlet and outlet openings, helically disposed blades adjacent said inlet opening, tie-rods extending crosswise of said drum, a header screen spaced from thehead of said drum to form a discharge chamber,

- and a cylindrical screen plate spaced from the walls of said drum ment for finished pulp. I

j 9. A mill for reducing pulp, comprising a to .form a compartdrum mounted on an inclined axisof rota tion and provided with inlet and discharge openings, a cylindrical screen spaced from the walls of'saiddrum to form a dischargev chamber, and helically disposed blades dividing said discharge chamber, into comparta tapering upper end and with inlet and outlet openings and helically disposed blades provided in said tapering portion to assist the forward movement of a charge of pulp.

11. A mill for reducing pulp, comprising an inclined rotatable cylinder provided with an inlet and a discharge opening and a pluet end of said cylral-ity of cross-rods for agitating a charge of pulp within said cylinder.

12. A mill'for reducing pulp, comprising .an inclined rotatable cylinder, a cylindrical screen spaced from the walls of said cylinder to form a discharge chamber,-and aplurality of blades disposed helically within said discharge chamber.

13. A mill of the class described, comprising a rotatably mounted inclined cylinder.

having inlet and discharge openings, helically disposed blades adjacent said inlet opening,,agitator rodsdisposed crosswise of said drum, a-concentrically disposed cylindrical screen spaced Within the walls of said cylinder to form a compartment for finished product, a plurality of helically disposed blades provided in said compartment, a perforated diaphragm spaced from the head of said cylinder, said diaphragm having notches provided in its periphery to .form discharge openings for said compartment for finished pulp, water channels provided. on the outer surface of said diaphragm, an axially disposed water supply pipe connected with said water channels, radial blades dividing the' space between said diaphragm and the end of said cylinder into segmental compartments, a discharge box and a vertically movable discharge pipe.

14.' A mill for reducing pulp, comprising i a rotatable cylinder provided with axially disposed inlet .and discharge openings, a

header screen in the discharge end of said cylinder, and a concentrically disposed-by lindrical screen spaced'within the walls of said cylinder to form an annular passage compartment for disintegrated pulp, and means to introduce water within the c 'ylinr der.

15. A mill for reducing pulp, comprising a rotatable. cylinder provided with axially header screen in the discharge end of said cylinder, and a concentrically disposed cylindrical screen spaced within-the walls of said cylinder to form anannular passage compartment for disintegrated pulp, means to introduce water within-the cylinder and means to maintain the level of water within said cylinder at predetermined heights.

Signed at Montclair, New Jersey, this 11th 7 day of March 1915.

GUY o. HOWARD.

i Witnesses:

' W. O. HENKE,

I. NEWTON Runonns.

I disposed inlet and discharge openings, a 

